Electroplating-generator.



D. MCDERMID.

ELECTROPLATING GENERATOR.

APPLlcATloN msn JULY 22. 1914.

Patented Dec. 21, 1915.

2 SHEETS-SHEET l.

D. McDERMID.

ELECTROPLATING GENERATOR.

APPLlcAloN man JULY 22,1914.

1,164,734. Patented Dec. 21, 1915.

2 SHEETS-SHEET 2- DONALD McI-)ERMID, OF IRVINGTON, NEW JERSEY.

ELECTROPLATING- GENERATOR.

Specification of Letters Patent. Patented Dec. 21, 1915.

Application led July 22, 1914. Serial No. 852,339.

To a7] uzom it may concern:

Be it known that I, DONALD MCDERMID, a citizen of the United States, andresident of Irvington, in the county of Essex and State of New Jersey,have invented a new and useful Improvement in Electroplating-Generators, of which the following is a specification.

The object of my invention is to provide double commutatorelectroplating generators with devices to conveniently permit thegenerators to be arranged for either delivering the totaloutput atapproximately 6 volts'or to deliver the total output at approximately l2volts, or to divide the output so that it :may be delivered in part at Gvolts and in part at 12 volts.

Another ooject of the invention is to accomplish the foregoing resultsefficiently in an improved manner and to eliminate the difiicultyusually experienced in manipulating the heavy cables which are used as'ture leads this type of generator; and also to maire ,ossihle forelectroplating generators he manufactured and placed in stock7 ready forsale, either to lill a demand for 6 volt or l2 volt machines.

Another object of the invention is to utilize copper arc shaped bars inplace of of the heavy arn'iature lead cables, which would otherwise lhave to ce hent around inside the frame of the generators, which cablesare objectionable because such cables fr and heavy that they cannot heconveniently manipulated or bent at suitable angles 't iis purpose; inmy ini-fention l make all the armature lead cables the same length andinterchangeable.

In double commutator electroplating generators it has been customary totaire leads from 'the armature to two sets of terminais? one mounted onfront and one on the haelt the machine, in order that the stiff andheavy cables forming the armature leads may he made as short aspossible, and the arrangement of the parts which l have vented savescopper' and therefore saves ei;- pense, and at the same time increasesthe convenience of the generator.

rEhe invention consists of the improved arrangement and form of thearmature leads, the arc hars, and the transfer panel, as will he fullypointed out in the claim.

Referring to the accompanying drawings: Figure l is a plan View of mygenerator showing the heavy armature leads and the transfer panelmounted on the frame of the generator. Some of the parts are in crosssection. Fig. 2 is an elevation of Fig. l showing the armature leadsconnected in parallel at the transfer panel for delivering the totaloutput of the machine at 6 volts. Fig. 3 is a side View of one of thearc bars and shows its relation to the other parts. F ig. 4 is anelevation of the transfer panel and the armature leads connected on tothe transfer panel to deliver hoth 6 and 12 volts. Fig. 5 is like Fig. iexcept that the neutral terminal lug is left olf so that the totaloutput of the machine will be delivered at 12 volts.

Referring particularly to Figs. l and 2, an ordinary bipolar, doublewound armature9 double commutator, electroplating generator is shown,provided at one end with a hrush holder stud l0, connected to an are harll which is also supported hy another hrush holder stud l2, through thernediurn of van insulating bushing i3, which also supports the orushholder stud in position the usual manner. The arc har il also providesterminal boss iii into u -nserted a heavy oahle armature iich has aterminal 16. The brush noldei ud is attached to a terminal i7' which`ached a lead i@ rtving other t.' The leads l5 and i3 are similar toeach other and have a diifer ence of potential of 6 volts. it the otherend of the generator a brush holder carries har 2l, which is alsosupported hy another l sh holder stud 22, through the medium of aninsulating bushing 23, which also s A orts the lorush holder stud 22 inposition in the usual i Aanner. rThe are har 2l also provides a terminalboss into which is inserted heavy cahle armature lead 259 which has a'terminal 26. rlhe brush holder stud 22 is attached to a terminal 27which is attached to a lead 289 having another terminal 29. The leads 25and 28 are similar to each other and have a difference of potential of Svolts; these leads are also similar to the leads 15 and 18. The leads l5and 25 are of similar polarity and are connected through theirrespective terminals 16 and 26 to the connecting har 30, which isprovided with a terminal 3l, from which a cable may carry current to aplating tank. The connecting bar 30 is mounted on a. transfer panel 32,which is made of insulating material, and secured to the front of thegenerator. The leads 18 and 28 are of simllar polarity and are connectedthrough their respective terminals 19 and 2.9 to the connecting bar 33,which is provlded W1th a terminal 34 from which a cable may carrycurrent to the plating tank. In the parallel arrangement of the leadsshovvn in Figs. 1 and 2, the generator delivers lts total output fromthe transfer panel to the plating tank at 6 volts.

In Fig. 4 the connecting bar 33 has been removed and the leads 25 and 28crossed at the transfer panel 32, so that there 1s a potential of 6volts between the terminal 31 and a terminal 35 which is shown connectedto the terminal 19 through a short connecting bar 36. There is also apotential of 6 volts between the terminal 31 and a terminal 37, which isconnected to the terminal 26 by a short connecting bar 38. Thus oneplating tank can be operated at 6 volts by connecting it to theterminals 31 and 35. A second tank can be operated at 6 volts byconnecting it to the terminals 31 and 37. A third tank can be operatedat 12 volts b connecting it to the terminals 35 and 3 in this third tankthe full potential of the double armature in series is utilized.

In Fig. 5 the terminal 31 is left ed' so the generator acts as astraight 12 volt generator, the connections are otherwise the same as inFig. 4.

In Fig. 3 the shape of the arc bar 11 is shown 'to illustratetheconvenient practical manner in which it allows all the leads to be:made short, similar to each other, and to all be brought to thetransfer the front of the generator.

The improved arc bar, the heavy leads of uniform length all on the frontof the generator, and the transfer panel make my generatorinterchangeable for 6 or 12 volts, and While I have described myimprovements with relation to a specific electroplating generator, myimprovements may be adapted to other types of electroplating and lowvoltage generators Without departing from the spirit of this invention.

I claim:

In the generator for heavy currents of low voltage the combination of arevoluble shaft, an arnmture and commutator bars carried by said shaft,a brush holder stud of one sign located upon one side of said shaft, abrush holder stud of a different sign located upon the side of saidshaft diametrically opposite the first-mentioned stud, an arc barconnected to the rstmentioned stud and in direct conductive connectionthere- With, said arc bar curving in the proximate form of a semi-circlearound said shaft and provided with a hole through which said secondmentioned stud extends, a sleeve of insulating material encircling saidsecond panel 32 on mentioned stud and extending through said` hole, aconductor connected to said second mentioned stud, and a secondconductor connected to said arc bar at a point in close proximity tosaid second mentioned stud.

DONALD MDERMID.

Witnesses:

DoNALnM. BLISS, G. G. QmNN.

